1 files changed, 73 insertions, 0 deletions
diff --git a/third_party/rust/cubeb-backend/src/log.rs b/third_party/rust/cubeb-backend/src/log.rs
new file mode 100644
index 0000000000..ca297d0038
--- /dev/null
+++ b/third_party/rust/cubeb-backend/src/log.rs
@@ -0,0 +1,73 @@
+// Copyright © 2017-2018 Mozilla Foundation
+//
+// This program is made available under an ISC-style license.  See the
+// accompanying file LICENSE for details.
+
+#[macro_export]
+macro_rules! cubeb_log_internal {
+    ($level: expr, $msg: expr) => {
+        #[allow(unused_unsafe)]
+        unsafe {
+            if $level <= $crate::ffi::g_cubeb_log_level.into() {
+                cubeb_log_internal!(__INTERNAL__ $msg);
+            }
+        }
+    };
+    ($level: expr, $fmt: expr, $($arg: expr),+) => {
+        #[allow(unused_unsafe)]
+        unsafe {
+            if $level <= $crate::ffi::g_cubeb_log_level.into() {
+                cubeb_log_internal!(__INTERNAL__ format!($fmt, $($arg),*));
+            }
+        }
+    };
+    (__INTERNAL__ $msg: expr) => {
+        if let Some(log_callback) = $crate::ffi::g_cubeb_log_callback {
+            use std::io::Write;
+
+            let mut buf = [0 as u8; 1024];
+            let filename = std::path::Path::new(file!())
+                .file_name()
+                .unwrap()
+                .to_str()
+                .unwrap();
+            // 2 for ':', 1 for ' ', 1 for '\n', and 1 for converting `line!()` to number of digits
+            let len = filename.len() + ((line!() as f32).log10().trunc() as usize) + $msg.len() + 5;
+            debug_assert!(len < buf.len(), "log will be truncated");
+            let _ = write!(&mut buf[..], "{}:{}: {}\n", filename, line!(), $msg);
+            let last = std::cmp::min(len, buf.len() - 1);
+            buf[last] = 0;
+            let cstr = unsafe { std::ffi::CStr::from_bytes_with_nul_unchecked(&buf[..=last]) };
+            log_callback(cstr.as_ptr());
+        }
+    }
+}
+
+#[macro_export]
+macro_rules! cubeb_logv {
+    ($msg: expr) => (cubeb_log_internal!($crate::LogLevel::Verbose, $msg));
+    ($fmt: expr, $($arg: expr),+) => (cubeb_log_internal!($crate::LogLevel::Verbose, $fmt, $($arg),*));
+}
+
+#[macro_export]
+macro_rules! cubeb_log {
+    ($msg: expr) => (cubeb_log_internal!($crate::LogLevel::Normal, $msg));
+    ($fmt: expr, $($arg: expr),+) => (cubeb_log_internal!($crate::LogLevel::Normal, $fmt, $($arg),*));
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_normal_logging() {
+        cubeb_log!("This is log at normal level");
+        cubeb_log!("{} Formatted log", 1);
+        cubeb_log!("{} Formatted {} log {}", 1, 2, 3);
+    }
+
+    #[test]
+    fn test_verbose_logging() {
+        cubeb_logv!("This is a log at verbose level");
+        cubeb_logv!("{} Formatted log", 1);
+        cubeb_logv!("{} Formatted {} log {}", 1, 2, 3);
+    }
+}